Lock.



No. 745,064. PATENTED NOV. 24., 1903.

O. KATZENBERGER.

LOCK.

APPLICATION FILED AUG. 27, 1.903.

N0 MODEL. 2 SHEETS-SHEET 1.

lll

A TTOHNEYS No. 745,064. PATBNTED NOV. 24, 1903.

- 0. KATZENBERGER.

LOOK.

APPLICATION FILED AUG. 2 7, 1903.

A TTOHNE YS No. 'mace-.

UNITED STATES Patented November 24, 1903.

PATnT rtree..

OSCAR KATZENBERGER, OF SAN ANTONIO, TEXAS, ASSIGNOR TO KATZEN- BERGERKEYLESS LOCK COMPANY, OF SAN ANTONIO, TEXAS.

LOCK.

SPECIFICATION forming part of Letters Patent No. 745,064, dated November24, 1903.

Application tiled August 27, 1903. Serial No. 170,967. (No model) To allwhom, it may concern;

Be it known that I, OSCAR KATZENBERGER, a citizen of the United States,and a resident of San Antonio, in the county of Bexar and State ofTexas, have invented new and useful Improvements in Locks, of which thefollowing is a full, clear, and exact description.

This invention relates to locks of the permutation type, and moreparticularly to such to as embody the generic features covered byLetters Patent of the United States granted to me July 23, 1901, No.678,956, and also on February 1S, 1902, No. 693,719, and has for itsobject to provide novel and essential details of improvement for a lockof the character indicated which are applicable to all kinds of lockswhere `said features of novelty can be made to coact, these detailsrendering the lock more convenient to operate, more zo dilicult tosurreptitiously open, enables the quick arrangement of parts 0n aspecial combination, so as to change it at will, facilitates the lockingof the lock when the details are changed from open adjustment, andenables the working of the lock mechanism to open it either by sense oftouch or visual observation or both together.

A further object is to adapt the novel constructive details forproduction by modern 3o' methods of machine manufacture, so as tocheapen the lock, enable its rapid construction in quantity, and affordan absolutelysafe lock at a moderate cost.

The invention is illustrated in one form of its application in theaccompanying drawings, that form a part of this specification, andessentially consists in the novel features of construction therein shownand as is hereinafter described, and defined in the appended 4o claims.

The features of the present improvement are particularly well adaptedfor application to a padlock and to exemplify their coactive operationare represented as forming the working mechanism of such a lock.

In the drawings, which represent the de-- tion thereon. Fig. 2 is a sideview of the same, showing the working parts exposed by the removal of aside wall of the lock-casing, said parts being adjusted to release thebowed shackle of the lock, which is thrown into open position. Fig. 3 isa side view of the lockcasing opened at the same side as in Fig. 2,parts being removed therefrom, so as to expose novel details seen on theline 3 3 in 6o Fig. 6Y in the direction of the arrows. Fig. 4 is atransverse sectional view of parts substantially on the line 4 4 in Fig.2. Fig. 5 is a side view of the open lock-casing and of the Workingparts shown in locked condition. Fig. Gis an enlarged transversesectional view of the closed lock-case and of novel details therein,taken substantially on the line 6 6 in Fig. 1; and Fig. 7 is atransyverse sectional view of details substantially 7o on the line 7 7in Fig. 3.

The lock-case comprises a back Wall 10, a front wall 11, and an edgewall 12 of usual `form-that is to say, the two similar wallplates 10 and11 are mainly circular on their 75 edges and are spaced apart parallelwith each other by the curved edge wall, that is positioned flush withsaid edges. A straight edge portion is formed on the periphery of eachwall 10 11, and preferably on the back wall 8o 10 is erected acorresponding straight wall 13, that is positioned -between the oppositeeX- tremities a a Aof the curved edge wall or plate 12, leaving twoopenings b Z9 intervening the ends of the straight wall and said ends ofthe edgewall.

Four similar studs 14, 15, 16, and 17 are transversely secured at nearlyequidistant points between the back and front walls 10 11, these studsbeing located near the inner go surface of the edge Wall 12, and the twolast'- named studs 16 17 are respectively positioned opposite and nearto the open-ings b b'.

At a suitable point near the center of the case a pivot-post 18 iserected from the front 95 wall 11 and nearly contacts with the backwall10 when the latter-named wall is secured in place upon the ends ofthe studs 14 1516 17, that pass through perforations in the said backwall to be riveted thereon or be otherwise secured thereto when the lockis conipleted.

ICG

The four arms 19 19 19b 19c of the deten-t` dog are so relativelydisposed in pairs that each two dog members which project opposite fromeach other have one side edge c thereof alined with a side edge on theopposite dog member, and said alined side edges, if prolonged to meeteach other, would intersect the axial center of the pivot-post 18.

Opposite the respective alined side edges c c c c and at a properdistance therefrom four short cylindrical shafts 2O 2l 22 23 arerespectively journaled in the front wall 11. The journal-shafts arerespectively provided with a collar-like cylindrical enlargement 2Oa 2la22a 23a, that loosely contacts with the eX- terior flat surface of theside wall 11,and preferably integral with each cylindrical enlargement aperipherally-roughened cylindrical knob 20b 2lb 22b 23 is thereonformed, which afford convenient means to manipulate the shafts for theirrespective rotatable adjustment.

Upon the journal-shafts 2O 21 22 23 circu lar tumbler-wheels 24 25 26 27are respectively mounted and secured either by frictional engagementofthe shaft Within the cen- ,and arrangement of the parts as describedtral bore of the Wheel or by other suitable means, each tumbler-wheelhaving its otherwise smooth circular periphery indented with a series ofV-shaped notches d, that are evenly spaced apart by teeth c, that tapersomewhat toward their Vouter ends and are rounded on said ends, as shownin Fig. 3.

Upon the center post 18, beneath the fourarmed dog previously described,two pairs of spring-detents are mounted and project radially therefrom.One pair of the detents consists of a resilient wire strand that at itslongitudinal center is Wrapped around the post 18 near its base to forma spring-coil, and thence extends oppositely therefrom to produce thespring-Wire arms 24Jt 26, that respectively terminate in angularly-benttoes f g, which respectively engage in appropriate notches d between theteeth e on the tumbler-Wheels 2t 26. In a like manner the remaining pairof detents consists of a resilient wire strand that is Wrapped aroundthe body of the post 18` immediately above the spring-coil from whichthe detent-arms 24;a 26"L are extended, and from said upper coil extendthe resilient arms 25a 27, that terminate in V-shaped toes f' g', thatare bent on the ends of the arms and respectively engage betweenappropriate teeth e onthe tumbler- Wheels 25 27. lt is obvious that whenthe knobs which project from the journal-shafts 20,21, 22, and 23 areturned the toes on the Y detentarms just described will yield andsuccessively enter the notches d, that space apart the angular teeth e,said arms having sufficient tensile force to prevent an accidentalturning movement of the tumbler-wheels with which they are engaged.

Upon each tumbler-wheel 24C, 25, 26, and 27 (see Fig. 6) a thin flatwasher h is seated after being passed over the ends of the journalshaftswhereon said wheels are secured, and upon each washer h a cup-likefriction-disk 28 is seated, saiddisks, that are in Washer form, beingstrung upon the journal-shafts so as to permit them to engage at andnear their edges with the washers h.

On each journal-shaft 20, 21, 22, and 23 an abutment-collar 29 ismounted, said collars each having a segment removed from the edgeportion, so as to produce a flat side t onthe otherwise circularperiphery. The segmental abutment-collars 29 are fitted measurably tightupon the journal-shafts, but yet are permitted to slide longitudinallyor be turned under pressure, and each collar is held pressed down upon arespective friction-disk 28 by an open keeper-ring 30, that isintroduced into a circumferential groove 7c, formed at a suitable pointin the journal-shaft said ring is to embrace, and the latter is wheninserted so closed by lateral pressure thereon as to become a fixture onthe shaft, and thus hold the collar 29, with which it is in contact,forcibly compressed upon a respective disk 28.

It will be apparent that by the construction the flat surfacest' on theabutment-collars 29 may each be held at a desired point rotatablyconsidered with regard to the teeth e on the tumbler-wheel that is fixedon a respective shaft, this relative disposal of the straightabutment-walls i being obviously produced by frictional contact of thedisks 28 with the dat Washers h, that are thus frictionally pressed uponthe tumbler-Wheels,and also by the frictional engagement of said diskswith the collars 29.

The bowed shackle 3l of the padlock is provided with a neck 4m at one ofits ends, and on said neck, that is designed to rock in the opening b',a preferably circularly-edged hub 3la is formed that is centrally andtransversely perforated to receive the stud V17, Whereon the shackle isdesigned to rock, the width of the opening b permitting this movement tobe eected while the hub is positioned within the lock-case.

A throw-spring 32 is secured by one scrollbent end upon the body of thestud llt and thence extends along the inner surface of the edge wall 12to have contact with a projection m', formed on the periphery of the hub31a, this engagement of the spring at its free end with the hub adaptingsaid spring to throw the shackle from closed adjustment, as shown inFig. 5, upward and outward, as rep- .resented in Fig. 2, when theshackle is free at its opposite end. The free end of the shackle 3l isformedwith a latch-hook 3l", so reduced in thickness and Width as topermit Athe free insertion of said hook Within the IOS lIO

opening b, this reduction in size affording an offset shoulder nat thejunction ot' the latchhook with the larger body of the shackle, and itwill be noticed that the nose of the hook which projects from the edgethat is farthest from the wall 12V of the lock-case forms a shoulder 0thereon that is parallel with and properly spaced from the offsetshoulder n.

Opposite to and near the side of the hooknose on the shackle and levelon its upper side with the shoulder o when the shackle is in closedadjustment a rest-block p is formed or secured on the front wall 11 ofthe lockcase, and near the hub 31 another rest-block q is projected fromsaid front wall, the upper surface of said block q being spaced from andparallel with the straight wall13, that extends between the openings bb', which receive the ends of the shackle 3l.

A latch-bar 33 is provided having a thickness at and near one endthereof which adapts it to freely slide without looseness between therest-block q and the true inner surface of the wall-piece 13, whereon itengages at and near each end of the bar and wall. The thickness of thelatch-bar 33 between its upper and lower sides at and near therest-block p is so proportioned that it will slidably engage betweensaid rest-block and the end portion of the transverse case-wall 13,adjacent tothe opening b, so that the latch-bar is held to slidelongitudinally without improper play between the wall13 and rest-blocksp and q, it being understood that the slide-bar is also in loose contactwith the front and back wallplates 11 and 10 of the lock-case.

A preferably dovetail notch r is formed in the lower edge of the forwardend portion of the latch-bar 33, said notch of proper depth being sovlocated that a latch-nose s is left remaining intact with the latch-barat its eX- tremity which is near vthe rest-block p, and, as shown, saidlatch-nose s rests upon and is adapted to reciprocate on the rest-blockp, so that the latch-nose s may be slid endwise into latched engagementwith the shoulder o on the shackle 3l when the latter is in closedcondition, as shown in Fig. 5.

One member 19b of the four-limbed dog that is held to rock on thepivot-post 18 is extended toward the notch r in the latch-bar 33 and atand near its free end is reduced somewhat in thickness, consideredlaterally, so as to provide ashort finger t thereon, which enters saidnotch.

A plate-spring u, that is normally straight, is attached by one end uponthe arm 19, whereon it may be clamped by the secured strip 19d, andthence projects at an acute angle from the finger t, so as to disposethe free end of the spring u within the dovetail notch r in contact withthe forward trans` verse wall ofsaid notch and pressing thereon, so asto hold the linger t in contact with the rear inclined wall of the notch'l'.

Therest-block p is sloped to remove its rear upper corner, and thusaccommodate the spring u, when the spring is somewhat compressed byaforward sliding movement ot the bar 33, as shown in Fig. 5, effected bymeans that is hereinafter described.

Upon the stud 15 a coiled wire spring 34 is mounted, as indicated inFigs. 2, 3, 4, and 5, one portion of the spring extending from the lowerend of its coil suiiiciently to produce a spring member o, that contactswith the edge Wall12 of the lock-case near the front wall 11. From theother end of the coil that in service is located near the rear wall 10of the case another spring member w is projected toward the arm 19a ofthe detent-dog, and on said spring member w a dependingl limb w isformed that contacts with the dog member 19a, the tension of thespring-coil 34: and the members thereon being exerted to press the fourarms of the detent-dog in the direction of the curved arrow in Figs. 2and 5.

On each of the collars 2Oa 21a 22a 23a, that are adjacent to the frontwall 11 of the lockcase, a series of indicating-marks vy are formed,which are spaced apart evenly and equally with the spaces d between ltheteeth e on respective tumbler-wheels 24, 25, 26, and 27, and upon saidfront wall of the case a single indicating-mark ,a is located oppositethe indicating-marks 'y on each collar mentioned. The marks y on eachcollar equal in number the teeth formed on the tumbler-wheels, and whensaid wheels are turned preferably to the right, as is indicated by thecurved arrow at each knob, each notch d between the teeth e on eachtumbler-wheel, being alined with a respective indicating-mark y on thecollar that is fixed on the journal-shaft whereon a respectivetumbler-wheel is affixed, will come opposite the mark s on the case whenan approximatevtoe ff org g' drops into an alined notch CZ, so that theposition of any one of the tumbler-wheels rotatably considered will beclearly shown by the mark y on the respective collar which is disposedby the turning movement of the collar and tumblerwheel directly oppositethe fixed mark on the case at that particular collar.

It will be seen that if the vknobs on the shafts 20 2l 22 23 are turnedso as to locate the flat abutments t on the collars 29 oppositerespective edges c on the four-armed dog the spring 34 will press saidarms against the straight edges 'L' of the collars and rock the dog inthe direction of the arrow x in Fig. 2, which will cause the finger t onthe dog-arm 19b to push the latch-bar 33 rearwardly a suficient distanceto remove the toefof thelatchbar from engagement with the shoulder o onthe shackle 3l that may have been engaged therewith, which will permitthe throw-spring 32 to throw the shackle 31 into the open position.(Indicated in Figs. 1 and 2.)

It mayr here be explained that in order to lock the lock it is onlynecessary to turn either one or all of the knobs on thejournalshafts 202l 22 23, so as to cause the plain circular portions of the peripherieson the abut- ICO ment-collars 29 to engage the edges c on the arms ofthe detent-dog, as this will rock the dog-arms toward the rest-blockpand push the latch-bar 33 so that the latching-nose s thereon willproject over the right-hand edge of said rest-block p against the stressof the plate-spring u. It will be seen in Figs. 2 and 5 that theright-hand end wall of the latchbar 33 is rendered convex, which permitsthe nose of the latch-hook on the shackle 31 to slide downward thereonand push the latchbar toward the left'side of the lock, the spring ureturning the nose s to its projected position, which causes the part sto slide into engagement with the shoulder o on the latchnose of theshackle, and thus lock the lock, and itis to be understood that thisadjustment of the latch-bar will be effected by the 'spring u whetherthe shackle is in closed or open adjustment.

To arrange the lock to be opened on a particular combination that willbe represented by the location of each detent-toe ff g g in a certainselected notch d on each tumblerwheel and also by a complementary markon each collar being disposed opposite a respective fixed 'mark a on thecase-wall, it is necessary that the four-armed dog be held stationarywhen the fiat places z' on the detentcollars are in contact with theedges c on the arms of said dog. For this purpose l have provided 'aset-screw 35, that is screwed into a tapped perforation in the edge walll2 of the case, so that it may be caused to impinge .on the end of anarm of the dog that is then `from rotation by the arms of the dog, eachtumbler-Wheel 24, 25, 26, and 27 may be adjusted to locate a respectivetoe ff g g' in a selected notch d in said tumbler-wheel, this notchbeing determined by its distance from the circular portion of theperiphery of the tumbler-wheel, it being understood that thetumbler-wheels are all to be turned tothe right, or in the direction ofthe curved arrows l in Fig. 1, while setting the lock to aparticulwheels are shown.

lar combination. For example, assuming that the knobs onthejournal-shaf'ts have been turned so as to dispose the detent-toe f'in the iirst notch din the tumbler-wheel 25,which would be thecommencement of the series of notches at the left hand, considered fromthe front of the lock, but that appears at the right in Fig. 3 Where therear faces of the tumbler- This Will be number one for theirstwheel 25.Next We set the tumblerwheel 26 by entering the toe g of the springarm26a in the second notch d from the plain' surface of the tumbler-wheel,as indicated in Fig. 3. This is the second number of the combination. Inalike manner thetumblerwheel 27 is moved so as to locate the toe g inthe third notch d in said wheel, and last the tumbler-wheel 24 is movedto seat the toe fon the spring-arm 24a in the fourth notch d in saidtumbler-wheel 24, counting from and including the first notch in theperiphery of the wheel, considered from, the right of the case viewedfrom the front side of the same. The combination,therefore, forunlocking the lockis 12 3 4, theinitial number, 1 being defined by thewheel 25, the next by the wheel 26, the third by the Wheel 27, and thefourth by the wheel 24, and when the wheels are adjusted by turning theknobs exterior of the case, so that the spring-pressed toes ff g g dropinto the appropriate notches, which can be felt by the operator or seenby inspection of the marks y on the respective collars 2Oa 2l 22L 23a,that come opposite the fixed marks e' on the case-wall 1l, the shackle31 is in condition for release, to effect which requires a slightpressure ou the shackle 31, as will now be made clear. l

It will be observed that the pressure of lthe throw-spring 32 is appliedat its free end upon the projection 'm' on the hub 31, that is below thepivot-stud 17, whereon the shackle 31 is held to rock. This arrangementof parts causes the shackle to be raised slightlyat its end whereon thelatch-nose 31b is formed and produces a slight crevice between theshouldern on the shackle and the upper side of the case-wall, as definedat a. (See Fig. 5.) This lifting action of the throw-spring 32 causesthe shoulder o on the latch-nose 3lb to press upon the lower side of theend s on the latchbar 33, so as to frictionally retain said bar fromsliding when the collars 29 have all been adjusted to dispose their fiatfaces z' opposite the edges c on the arms of the detent-dog, and thuspermit the spring 34 to exert its force for the slidable movement of thelatchbar by pressure ot' the finger t thereon. In other words, theslight friction between the latch-bar end s and the shoulder o preventsthe joint action of the springs 32 34 from sliding the latch-bar 33 andsimultaneously throwing the shackle 3l into open adjustment.

` To release the latch-bar and also give initial impetus to thethrow-spring 32, it is only necessary to press upon the bowed shackle soasA to close the crevice between its shoulder n and the case, which willcarry the shoulder o from engagement with the latch-bar 33 and permitthe springs 32 34 to instantly slide the bar 33 and throw up theshackle, the working parts of the lock then assuming the relativepositions represented in Fig. 2.

It is evident that the turning movement of IOC IIO

the shafts 2O 21 22 23 in either direction will Y not injure the lock;but the adjustment to unlock it should be conducted as hereinbeforedescribed.

raaoei As the spring-arms that press the detenttoes ff g g intorespective notches d in the tumbler wheels are comparatively weak, thereis but little noise made in working the shafts carrying thetumbler-wheels while arranging them to open the lock, but the actionwill be plainly felt and the notches occupied will be indicateddistinctly in that manner and also by a visual inspection of the marks yon the collars that are designated by their positions with regard to themarks z on the case.

It will be seen from the foregoing description of novel details that theimproved permutation-lock may be changed in combination an indefinitenumber of times, that the change for setting the tu mblers on a newcombination may be effected by sense of touch only, that the lock may belocked or unlocked in the dark, and that the lock is safe againstpicking or opening by turning the knobs unless the combination is known,and the operator is aware that as a iinal manipulation the shackle mustbe pressed upon the lockcase.

Having thus described my invention, I claim as new and desire to secureby Letters Patentl. In a lock of the character described, thecombination with a case, a rotatably-supported locking-collar therein,and a springpressed dog having an arm and pivoted in the case, andcontrolled in rocking movement by the collar, of a latch-bar engagedwith the armand moved in one direction therewith, and means carried bysaid arm, adapted to slide the latch-bar in the opposite direction.

2. In a lock of the character described, the combination with a case, aplurality of rotatably supported locking -collars therein, means forrotating the collars, and a springpressed dog pivoted in the case,having arms, the-edges on which have contact with said collars, of alatch-bar engaged by one arm of the dogy and moved in one directiontherewith, and means, carried by said arm,adapted to slide the latch-barin the opposite direction.

3. In a lock of the character described, the combination with a case, aplurality of locking-collars rotatably supported in` the case, eachcollarhavng a circular edge that merges into a fiat surface thereon, anda multiplearmed dog pivoted in the case and springpressed toward thecollars, the edges on the arms -of said dog engaging therewith, of alatch-bar engaged by one arm of the dog, and means, carried by said arm,adapted to slide the latch-bar in the opposite direction,

4;. In a lock of the character described, the combination with a case, aplurality of manually-operative shafts held to rotatein the case,circularly-edged collars mounted on respective shafts and each having aflat side, and a spring-pressed dog pivoted in the case, having arms,the edges on which engage said collars, of a latch-bar engaged by onearm of the dog, and means, carried by said arm,

adapted to slide the latch-bar in the opposite direction.

5. In a lock of the character described, the combination with a case, adog having a plurality of arms and pivoted inthe case,a spring adapted`to rock the dog in one direction, and adjustable means for controllingthe rocking movement of the dog, of a latch-bar having a 'notch thatloosely receives au arm of the dog and is moved in one directiontherewith, and a plate-spring extended from said arm into said notch,the pressure of the spring thereon being adapted to slide the latch-barin an opposite direction.

6. In a lock of the character described, th combination with va case, abowed shackle pivoted by one end in the case and having a latch-nose onthe opposite end,having a hookshoulder adapted to enter an opening inthe case, of a four-armed detent-dog pivoted between its arms on a postin the case, a notched latch-bar held to slide in the case, near an armof the dog that has a nger entered within the notch of the latch-bar, aplate-spring carried by said arm and extended into the notch, so as topress on the latch-bar oppovsitely from the pressure of the dog-arm, and

a supported coiled spring having arms that respectively press on a wallof the case and upon one arm of the dog.

7. In a lock of the character described, the combination with a case, adog having radially-edged arms and pivoted in the caseintermediate thearms, a coiled spring pressing the arms in one direction, a notchedslidable latch-bar engaged in its notch by one arm of the dog, spacedshafts journaled in the case, and frictionally-held collars carried bythe shafts, each having a circular edge iiattened at one side, the dogand latch-bar moving under stress of the coiled spring when the iiatsides of the collars are opposite the radial edges of the arms.

8. In a lock of the character described, the combination with a case, adog having radially-edged arms and pivoted in the case intermediate thearms, a coiled spring pressing the arms in one direction, a notchedslidable latch-bar engaged in its notch by one arm of the dog, spacedshafts journaled in the case, friction ally-held collars carried by theshafts, each collar having a circular edge flattened at one side, thedog and latch-bar moving under stress of the coiled spring when the flatsides of the collars are opposite the radial edges of the arms, and aplate-spring projected from the arm of the dog that enters the notch ofthe latch-bar, said spring also entering the notch and pressing thelatlchfbar ICO IIO

in a direction opposite from that given by the shackle.

10. In a lock of the character described, the

'combination with a case, of a four-armed detent-dog, a spring pressingthe arms of said dog in one direction, four shafts having knobs on oneend that are operative from Without the case, spring-pressed collars onthe shafts, having circular edges that are flattened at one side, alatch-bar held to slide in the case and engaged by one arm of the dog,said bar receiving slidable adjustment in one direction when the flatsides on the collars are turned opposite side edges of the arms, a bowedshackle pivoted by one end in an opening in the case, said shacklehaving a latchnose on the opposite end, said nose having a notched sideforming a locking shoulder thereon, and a plate-spring projected fromthe arm that engages in a notch in the latchbar, the plate-spring beingadapted to press the latch-bar for locked engagement With the shoulderon the nose of the shackle, when said shackle is rocked to enter itsnose Within the case.

11. In-a lockof the character described, the combination With a case, ofa plurality of shafts journaled in the front Wall of said case, eachshaft having a knob on its outer end, a tumbler-Wheel secured on eachshaft and contacting with the inner surface of the front wall, saidtumbler-wheels each having a series of notches spaced by slope-sidedteeth,

and resilient Wire-arms supported on a post in the case, each arm havingan integral detent-toe thereon, adapted to enter any one of the seriesof notches in a respective tumbler- Wheel.

12. In a lock of the character described, the combination With a case,and a detent-dog having a plurality of radial arms, said dog beingpivoted in the case between the arms, of a set-screw adjnstably held inthe edge wall of the case which by pressure on an end of one arm of thedog will hold said dog from turning on its pivot.

13. In a lock of the character described, the combination with a case, afour-armed dog held to rock on a post in the case, a latchbar slidablein the case and engaged by one arm of the dog, and a shackle that thelatchbar may engage, to hold a latch-nose on the shackle Within thecase, of four journalshafts having a knob on each, rotatable from theexterior of the case, each shaft having a tumbler-wheel secured thereonWithin the case, a Washer-'plate on the shaft, seated ou thetumbler-Wheel, a cupped resilient disk mounted on the shaft and engagingthe Washer, a circularly-edged collar on each shaft, seating on thecupped disk, said co1- lars having a flat side on each circular edge,each shaft havinga circumferential groove therein, and a closable splitkeeper-ring insertible and securable by its closure in the groove, thering holding the collar and disk compressed upon the washer and thetumbler- Wheel.

Inl testimony whereof I have signed my name to this specification in thepresence of two subscribing Witnesses.

OSCAR KATZENBERGER.

Witnesses:

J. E. TRAINER, W. I. GOFORTH.

